// SpryTabbedPanels.js - version 0.7 - Spry Pre-Release 1.6.1
//
// Copyright (c) 2006. Adobe Systems Incorporated.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of Adobe Systems Incorporated nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
(function () { // BeginSpryComponent

    if(typeof Spry == "undefined") window.Spry = {};
    if(!Spry.Widget) Spry.Widget = {};

    Spry.Widget.TabbedPanels = function (element, opts) {
        this.element = this.getElement(element);
        this.defaultTab = 0; // Show the first panel by default.
        this.tabSelectedClass = "TabbedPanelsTabSelected";
        this.tabHoverClass = "TabbedPanelsTabHover";
        this.tabFocusedClass = "TabbedPanelsTabFocused";
        this.panelVisibleClass = "TabbedPanelsContentVisible";
        this.focusElement = null;
        this.hasFocus = false;
        this.currentTabIndex = 0;
        this.enableKeyboardNavigation = true;
        this.nextPanelKeyCode = Spry.Widget.TabbedPanels.KEY_RIGHT;
        this.previousPanelKeyCode = Spry.Widget.TabbedPanels.KEY_LEFT;

        Spry.Widget.TabbedPanels.setOptions(this, opts);

        // If the defaultTab is expressed as a number/index, convert
        // it to an element.

        if(typeof (this.defaultTab) == "number") {
            if(this.defaultTab < 0)
                this.defaultTab = 0;
            else {
                var count = this.getTabbedPanelCount();
                if(this.defaultTab >= count)
                    this.defaultTab = (count > 1) ? (count - 1) : 0;
            }

            this.defaultTab = this.getTabs()[this.defaultTab];
        }

        // The defaultTab property is supposed to be the tab element for the tab content
        // to show by default. The caller is allowed to pass in the element itself or the
        // element's id, so we need to convert the current value to an element if necessary.

        if(this.defaultTab)
            this.defaultTab = this.getElement(this.defaultTab);

        this.attachBehaviors();
    };

    Spry.Widget.TabbedPanels.prototype.getElement = function (ele) {
        if(ele && typeof ele == "string")
            return document.getElementById(ele);
        return ele;
    };

    Spry.Widget.TabbedPanels.prototype.getElementChildren = function (element) {
        var children = [];
        var child = element.firstChild;
        while(child) {
            if(child.nodeType == 1 /* Node.ELEMENT_NODE */ )
                children.push(child);
            child = child.nextSibling;
        }
        return children;
    };

    Spry.Widget.TabbedPanels.prototype.addClassName = function (ele, className) {
        if(!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) != -1))
            return;
        ele.className += (ele.className ? " " : "") + className;
    };

    Spry.Widget.TabbedPanels.prototype.removeClassName = function (ele, className) {
        if(!ele || !className || (ele.className && ele.className.search(new RegExp("\\b" + className + "\\b")) == -1))
            return;
        ele.className = ele.className.replace(new RegExp("\\s*\\b" + className + "\\b", "g"), "");
    };

    Spry.Widget.TabbedPanels.setOptions = function (obj, optionsObj, ignoreUndefinedProps) {
        if(!optionsObj)
            return;
        for(var optionName in optionsObj) {
            if(ignoreUndefinedProps && optionsObj[optionName] == undefined)
                continue;
            obj[optionName] = optionsObj[optionName];
        }
    };

    Spry.Widget.TabbedPanels.prototype.getTabGroup = function () {
        if(this.element) {
            var children = this.getElementChildren(this.element);
            if(children.length)
                return children[0];
        }
        return null;
    };

    Spry.Widget.TabbedPanels.prototype.getTabs = function () {
        var tabs = [];
        var tg = this.getTabGroup();
        if(tg)
            tabs = this.getElementChildren(tg);
        return tabs;
    };

    Spry.Widget.TabbedPanels.prototype.getContentPanelGroup = function () {
        if(this.element) {
            var children = this.getElementChildren(this.element);
            if(children.length > 1)
                return children[1];
        }
        return null;
    };

    Spry.Widget.TabbedPanels.prototype.getContentPanels = function () {
        var panels = [];
        var pg = this.getContentPanelGroup();
        if(pg)
            panels = this.getElementChildren(pg);
        return panels;
    };

    Spry.Widget.TabbedPanels.prototype.getIndex = function (ele, arr) {
        ele = this.getElement(ele);
        if(ele && arr && arr.length) {
            for(var i = 0; i < arr.length; i++) {
                if(ele == arr[i])
                    return i;
            }
        }
        return -1;
    };

    Spry.Widget.TabbedPanels.prototype.getTabIndex = function (ele) {
        var i = this.getIndex(ele, this.getTabs());
        if(i < 0)
            i = this.getIndex(ele, this.getContentPanels());
        return i;
    };

    Spry.Widget.TabbedPanels.prototype.getCurrentTabIndex = function () {
        return this.currentTabIndex;
    };

    Spry.Widget.TabbedPanels.prototype.getTabbedPanelCount = function (ele) {
        return Math.min(this.getTabs().length, this.getContentPanels().length);
    };

    Spry.Widget.TabbedPanels.addEventListener = function (element, eventType, handler, capture) {
        try {
            if(element.addEventListener)
                element.addEventListener(eventType, handler, capture);
            else if(element.attachEvent)
                element.attachEvent("on" + eventType, handler);
        } catch(e) {}
    };

    Spry.Widget.TabbedPanels.prototype.cancelEvent = function (e) {
        if(e.preventDefault) e.preventDefault();
        else e.returnValue = false;
        if(e.stopPropagation) e.stopPropagation();
        else e.cancelBubble = true;

        return false;
    };

    Spry.Widget.TabbedPanels.prototype.onTabClick = function (e, tab) {
        this.showPanel(tab);
        return this.cancelEvent(e);
    };

    Spry.Widget.TabbedPanels.prototype.onTabMouseOver = function (e, tab) {
        this.addClassName(tab, this.tabHoverClass);
        return false;
    };

    Spry.Widget.TabbedPanels.prototype.onTabMouseOut = function (e, tab) {
        this.removeClassName(tab, this.tabHoverClass);
        return false;
    };

    Spry.Widget.TabbedPanels.prototype.onTabFocus = function (e, tab) {
        this.hasFocus = true;
        this.addClassName(tab, this.tabFocusedClass);
        return false;
    };

    Spry.Widget.TabbedPanels.prototype.onTabBlur = function (e, tab) {
        this.hasFocus = false;
        this.removeClassName(tab, this.tabFocusedClass);
        return false;
    };

    Spry.Widget.TabbedPanels.KEY_UP = 38;
    Spry.Widget.TabbedPanels.KEY_DOWN = 40;
    Spry.Widget.TabbedPanels.KEY_LEFT = 37;
    Spry.Widget.TabbedPanels.KEY_RIGHT = 39;



    Spry.Widget.TabbedPanels.prototype.onTabKeyDown = function (e, tab) {
        var key = e.keyCode;
        if(!this.hasFocus || (key != this.previousPanelKeyCode && key != this.nextPanelKeyCode))
            return true;

        var tabs = this.getTabs();
        for(var i = 0; i < tabs.length; i++)
            if(tabs[i] == tab) {
                var el = false;
                if(key == this.previousPanelKeyCode && i > 0)
                    el = tabs[i - 1];
                else if(key == this.nextPanelKeyCode && i < tabs.length - 1)
                    el = tabs[i + 1];

                if(el) {
                    this.showPanel(el);
                    el.focus();
                    break;
                }
            }

        return this.cancelEvent(e);
    };

    Spry.Widget.TabbedPanels.prototype.preorderTraversal = function (root, func) {
        var stopTraversal = false;
        if(root) {
            stopTraversal = func(root);
            if(root.hasChildNodes()) {
                var child = root.firstChild;
                while(!stopTraversal && child) {
                    stopTraversal = this.preorderTraversal(child, func);
                    try {
                        child = child.nextSibling;
                    } catch(e) {
                        child = null;
                    }
                }
            }
        }
        return stopTraversal;
    };

    Spry.Widget.TabbedPanels.prototype.addPanelEventListeners = function (tab, panel) {
        var self = this;
        Spry.Widget.TabbedPanels.addEventListener(tab, "click", function (e) {
            return self.onTabClick(e, tab);
        }, false);
        Spry.Widget.TabbedPanels.addEventListener(tab, "mouseover", function (e) {
            return self.onTabMouseOver(e, tab);
        }, false);
        Spry.Widget.TabbedPanels.addEventListener(tab, "mouseout", function (e) {
            return self.onTabMouseOut(e, tab);
        }, false);

        if(this.enableKeyboardNavigation) {
            // XXX: IE doesn't allow the setting of tabindex dynamically. This means we can't
            // rely on adding the tabindex attribute if it is missing to enable keyboard navigation
            // by default.

            // Find the first element within the tab container that has a tabindex or the first
            // anchor tag.

            var tabIndexEle = null;
            var tabAnchorEle = null;

            this.preorderTraversal(tab, function (node) {
                if(node.nodeType == 1 /* NODE.ELEMENT_NODE */ ) {
                    var tabIndexAttr = tab.attributes.getNamedItem("tabindex");
                    if(tabIndexAttr) {
                        tabIndexEle = node;
                        return true;
                    }
                    if(!tabAnchorEle && node.nodeName.toLowerCase() == "a")
                        tabAnchorEle = node;
                }
                return false;
            });

            if(tabIndexEle)
                this.focusElement = tabIndexEle;
            else if(tabAnchorEle)
                this.focusElement = tabAnchorEle;

            if(this.focusElement) {
                Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "focus", function (e) {
                    return self.onTabFocus(e, tab);
                }, false);
                Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "blur", function (e) {
                    return self.onTabBlur(e, tab);
                }, false);
                Spry.Widget.TabbedPanels.addEventListener(this.focusElement, "keydown", function (e) {
                    return self.onTabKeyDown(e, tab);
                }, false);
            }
        }
    };

    Spry.Widget.TabbedPanels.prototype.showPanel = function (elementOrIndex) {
        var tpIndex = -1;

        if(typeof elementOrIndex == "number")
            tpIndex = elementOrIndex;
        else // Must be the element for the tab or content panel.
            tpIndex = this.getTabIndex(elementOrIndex);

        if(!tpIndex < 0 || tpIndex >= this.getTabbedPanelCount())
            return;

        var tabs = this.getTabs();
        var panels = this.getContentPanels();

        var numTabbedPanels = Math.max(tabs.length, panels.length);

        for(var i = 0; i < numTabbedPanels; i++) {
            if(i != tpIndex) {
                if(tabs[i])
                    this.removeClassName(tabs[i], this.tabSelectedClass);
                if(panels[i]) {
                    this.removeClassName(panels[i], this.panelVisibleClass);
                    panels[i].style.display = "none";
                }
            }
        }

        this.addClassName(tabs[tpIndex], this.tabSelectedClass);
        this.addClassName(panels[tpIndex], this.panelVisibleClass);
        panels[tpIndex].style.display = "block";

        this.currentTabIndex = tpIndex;
    };

    Spry.Widget.TabbedPanels.prototype.attachBehaviors = function (element) {
        var tabs = this.getTabs();
        var panels = this.getContentPanels();
        var panelCount = this.getTabbedPanelCount();

        for(var i = 0; i < panelCount; i++)
            this.addPanelEventListeners(tabs[i], panels[i]);

        this.showPanel(this.defaultTab);
    };

})(); // EndSpryComponent